NI-BASED ALLOY HAVING EXCELLENT CORROSION RESISTANCE AND WEAR RESISTANCE

摘要

PURPOSE:To improve the corrosion resistance and wear resistance of the title alloy by incorporating specific amounts of C, Al, Ti and Nb to an Ni-Cr-Mo alloy and specifying the relationship of the amounts among C, Ti and Nb. CONSTITUTION:The compsn. of the Ni-based alloy is constituted of, by weight, 0.4-1.5% C, 10-16% Cr, 9-16% Mo and =1.5% Al, is furthermore constituted of 1 or 2 kinds of =7.5% Ti and 2-14% Nb, at need =10% Fe and the balance consisting of Ni with inevitable impurities. The amounts of C, Ti and Nb are moreover regulated in such a manner that the relationship of (Ti/4)+(Nb/8)C is satisfied. Ti and Nb not only form MC type carbide together with C, but even after the formation of the carbide, excessive Ti and Nb remaining in an austenitic matrix also form fine deposits matching in the austenitic matrix together with Al and Ni by an aging treatment to improve hardness.